Logging

injectme is using NullHandler pattern for libraries which is described here https://docs.python.org/3/howto/logging.html#configuring-logging-for-a-library. As a result you will not see any logging output from injectme without providing configuration.

Currently, there are only DEBUG level messages logged by the injectme so there’s no point in configuring any other logging level for it.

Below you’ll find sample logging configuration, a piece of code using it and logging output.

Example:

example.py

from logging.config import dictConfig

from injectme import inject, register, clear_dependencies

logconf = {
    "version": 1,
    "formatters": {
        "standard": {
            "format": "%(asctime)s [%(levelname)s] %(name)s: %(message)s",
        },
    },
    "handlers": {
        "console": {
            "level": "DEBUG",
            "formatter": "standard",
            "class": "logging.StreamHandler",
            "stream": "ext://sys.stdout",
        },
    },
    "loggers": {
        "injectme": {
            "handlers": ["console"],
            "level": "DEBUG",
            "propagate": False,
        },
    }
}

dictConfig(logconf)


class Dependency:
    pass


@inject
class Service:
    dependency: Dependency

register(Dependency, Dependency())

Service()

clear_dependencies()

$ python3 example.py

2022-08-14 21:37:01,552 [DEBUG] injectme.injector: marking <class '__main__.Service'> as target for <injectme.injector.Injector object at 0x7fd798b8b940>
2022-08-14 21:37:01,552 [DEBUG] injectme.registry: registering <__main__.Dependency object at 0x7fd798b8bb50> as <class '__main__.Dependency'> dependency in <injectme.registry.DependenciesRegistry object at 0x7fd798b8b970>
2022-08-14 21:37:01,553 [DEBUG] injectme.injector: injecting into <__main__.Service object at 0x7fd798b8bc10> by <injectme.injector.Injector object at 0x7fd798b8b940> using <injectme.registry.DependenciesRegistry object at 0x7fd798b8b970>
2022-08-14 21:37:01,553 [DEBUG] injectme.registry: looking for <class '__main__.Dependency'> in <injectme.registry.DependenciesRegistry object at 0x7fd798b8b970>
2022-08-14 21:37:01,553 [DEBUG] injectme.registry: clearing <injectme.registry.DependenciesRegistry object at 0x7fd798b8b970> registry